Terrified of being pregnant again

I miscarried two weeks ago at 9 weeks. We have been trying to get pregnant for 2 years now, with the only other hint of being successful being last October when I had a chemical. I'm 33 and all rational thoughts tell me that everything is going to be fine and that I should start trying again.. But I'm so scared of being pregnant again. Scared of the responsibility of keeping a little ball of cells alive, scared of more loss. More sadness. More pressure on my body and weight on my heart.. Has anyone else been through this? Any advice?